Sleep Master Tejfirahn

When Sleep Master Tejfirahn enters the battlefield, attacks, or blocks all creatures are
tapped except for this creature.
Each of your endsteps if you control a tapped creature, Sleep Master Tejfirahn gets +1/+2 and
gets "When a blue creature enters the battlefield,
scry 2, and tap target creature you don't control,
it doesn't untap during its controller's next untap
step."
"They killed me, but learned my touch."